Graphene concentrated solution and preparation method therefor

Abstract

The invention relates to a graphene concentrated solution and a preparation method therefor. Firstly, water-soluble titanate is dissolved in water; then, graphene is added, a graphene dispersion solution is subjected to ultrasonic treatment in a magnetic field, and thus water-soluble titanate can be used for carrying out full surface modification on graphene in the water so as to achieve the effect of full dispersion for graphene; and finally, the graphene dispersion solution is subjected to distillation or reduced-pressure distillation in an externally-applied magnetic field, thereby preparing the graphene concentrated solution. The graphene concentrated solution is low in moisture content and high in graphene content, so that performance degradation caused by the fact that excess moisture is introduced during use is avoided; the number of active groups of the surface of graphene is increased due to modification by water-soluble titanate, so that the bonding force of graphene to other materials is increased; and modified graphene are not subjected to an agglomeration phenomenon, so that fully-stripped graphene can better exert the properties such as high strength, electrical conductivity, thermal conductivity and the like of graphene. By the method disclosed by the invention, the dispersity of graphene and the performance of products can be further improved.

Description

technical field

[0001] The invention belongs to the technical field of graphene new materials, and relates to a graphene concentrated liquid and a preparation method thereof, in particular to a graphite surface-modified graphene with water-based titanate in water and ultrasonically treated graphene in a magnetic field Graphene dispersion liquid, and the preparation method of the graphene concentrated liquid that distills graphene dispersion liquid or underpressure distillation in external magnetic field. Background technique

[0002] At present, graphene is widely used, but due to the small particle size of graphene, the smallest graphene length is only about 1 micron, which makes graphene very prone to agglomeration when it is used. The occurrence of agglomeration is not only It will have a great impact on product performance, and on the other hand, it will greatly increase the amount of graphene used, resulting in an increase in cost.

[0003] Graphene usually needs to be...

Examples

Embodiment 1

[0023]A kind of preparation method of graphene concentrated liquid, first water-based titanate bis (dioctyloxypyrophosphate) ethylene titanate solution is dissolved in water, the dissolving process is by the mode of mechanical stirring, and the rotating speed is 50 rev / min, the stirring time is 5 minutes, the temperature is 10°C, then add the graphene powder whose length and width are 1-200 microns respectively, and the thickness is 6-10 nanometers, aqueous titanate bis(dioctyloxycoke The quality of phosphate group) ethylene titanate is 2% of graphene powder quality, and in the magnetic field that magnetic field intensity is 0.5T, carry out ultrasonic dispersion, the ultrasonic frequency of ultrasonic dispersion is 20KHz, and power is 1 kilowatt, and ultrasonic dispersion time For 30 minutes, the temperature is controlled at 10°C to obtain a graphene dispersion, the mass fraction of graphene powder in the graphene dispersion is 0.5%; then the graphene is dispersed under the act...

Embodiment 2

[0025] A kind of preparation method of graphene concentrated solution, first the chelate (model 311W) solution of aqueous titanate bis(dioctyloxypyrophosphate) ethylene titanate and triethanolamine is dissolved in water, and the dissolved The process is through mechanical stirring, the rotation speed is 100 rpm, the stirring time is 30 minutes, and the temperature is 35°C. Then add graphene powder with a length and width of 1-200 microns and a thickness of 6-10 nanometers. The quality of the chelate solution of water-based titanate bis(dioctyloxypyrophosphate) ethylene titanate and triethanolamine is 1.5% of the graphene powder quality, and the magnetic field intensity is 5T to carry out ultrasonic Dispersion, the ultrasonic frequency of ultrasonic dispersion is 30KHz, the power is 5 kilowatts, the ultrasonic dispersion time is 90 minutes, and the temperature is controlled at 60°C, that is, a graphene dispersion liquid is obtained, and the mass fraction of graphene powder in th...

Embodiment 3

[0027] A kind of preparation method of graphene concentrated liquid, first dissolves aqueous titanate bis(dioctyl pyrophosphate) glycolate titanate in water, the process of dissolving is through the mode of mechanical stirring, and the rotating speed is 80 rpm / minute, the stirring time is 20 minutes, the temperature is 30 ℃, then add the graphene powder whose length and width are 1-200 microns respectively, and the thickness is 6-10 nanometers, aqueous titanate bis(dioctyl pyrophosphate ) The quality of glycolate titanate is 1.5% of the graphene powder mass, and ultrasonic dispersion is carried out in a magnetic field with a magnetic field strength of 2T. The ultrasonic frequency of ultrasonic dispersion is 10KHz, the power is 3 kilowatts, and the ultrasonic dispersion time is 50 Minutes, temperature control is 20 ℃, promptly obtains graphene dispersion liquid, and the mass fraction of graphene powder in graphene dispersion liquid is 6%; Then under the action of the external ...

technical field

[0001] The invention belongs to the technical field of graphene new materials, and relates to a graphene concentrated liquid and a preparation method thereof, in particular to a graphite surface-modified graphene with water-based titanate in water and ultrasonically treated graphene in a magnetic field Graphene dispersion liquid, and the preparation method of the graphene concentrated liquid that distills graphene dispersion liquid or underpressure distillation in external magnetic field. Background technique

[0002] At present, graphene is widely used, but due to the small particle size of graphene, the smallest graphene length is only about 1 micron, which makes graphene very prone to agglomeration when it is used. The occurrence of agglomeration is not only It will have a great impact on product performance, and on the other hand, it will greatly increase the amount of graphene used, resulting in an increase in cost.

[0003] Graphene usually needs to be...

Examples

Embodiment 1

[0023]A kind of preparation method of graphene concentrated liquid, first water-based titanate bis (dioctyloxypyrophosphate) ethylene titanate solution is dissolved in water, the dissolving process is by the mode of mechanical stirring, and the rotating speed is 50 rev / min, the stirring time is 5 minutes, the temperature is 10°C, then add the graphene powder whose length and width are 1-200 microns respectively, and the thickness is 6-10 nanometers, aqueous titanate bis(dioctyloxycoke The quality of phosphate group) ethylene titanate is 2% of graphene powder quality, and in the magnetic field that magnetic field intensity is 0.5T, carry out ultrasonic dispersion, the ultrasonic frequency of ultrasonic dispersion is 20KHz, and power is 1 kilowatt, and ultrasonic dispersion time For 30 minutes, the temperature is controlled at 10°C to obtain a graphene dispersion, the mass fraction of graphene powder in the graphene dispersion is 0.5%; then the graphene is dispersed under the act...

Embodiment 2

[0025] A kind of preparation method of graphene concentrated solution, first the chelate (model 311W) solution of aqueous titanate bis(dioctyloxypyrophosphate) ethylene titanate and triethanolamine is dissolved in water, and the dissolved The process is through mechanical stirring, the rotation speed is 100 rpm, the stirring time is 30 minutes, and the temperature is 35°C. Then add graphene powder with a length and width of 1-200 microns and a thickness of 6-10 nanometers. The quality of the chelate solution of water-based titanate bis(dioctyloxypyrophosphate) ethylene titanate and triethanolamine is 1.5% of the graphene powder quality, and the magnetic field intensity is 5T to carry out ultrasonic Dispersion, the ultrasonic frequency of ultrasonic dispersion is 30KHz, the power is 5 kilowatts, the ultrasonic dispersion time is 90 minutes, and the temperature is controlled at 60°C, that is, a graphene dispersion liquid is obtained, and the mass fraction of graphene powder in th...

Embodiment 3

[0027] A kind of preparation method of graphene concentrated liquid, first dissolves aqueous titanate bis(dioctyl pyrophosphate) glycolate titanate in water, the process of dissolving is through the mode of mechanical stirring, and the rotating speed is 80 rpm / minute, the stirring time is 20 minutes, the temperature is 30 ℃, then add the graphene powder whose length and width are 1-200 microns respectively, and the thickness is 6-10 nanometers, aqueous titanate bis(dioctyl pyrophosphate ) The quality of glycolate titanate is 1.5% of the graphene powder mass, and ultrasonic dispersion is carried out in a magnetic field with a magnetic field strength of 2T. The ultrasonic frequency of ultrasonic dispersion is 10KHz, the power is 3 kilowatts, and the ultrasonic dispersion time is 50 Minutes, temperature control is 20 ℃, promptly obtains graphene dispersion liquid, and the mass fraction of graphene powder in graphene dispersion liquid is 6%; Then under the action of the external ...